JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 580 · 40 questions

Code tip (Line by line): let x = 5; makes a variable x holding 5; x = x + 2; changes it to 7. console.log(…) writes in the console; alert(…) shows a pop-up box. Text in quotes + anything = joined text: "5" + 3 → "53".

1. 1.⚡ What does this code show?
   let name = "Aman";
   console.log("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) name (d) Hello, Aman!
2. 2.⚡ Which word makes a new variable? (a) let (b) put (c) give (d) make
3. 3.⚡ What number does this code print?
   let a = 17;
   let b = 15;
   console.log(a + b);
4. 4.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
5. 5.⚡ What number does this code print?
   let a = 4;
   let b = 10;
   console.log(a * b);
6. 6.⚡ What does this code show?
   let name = "Meera";
   console.log("Hi, " + name + "!"); (a) Hi, Meera! (b) Hi, name! (c) Meera (d) name
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 1;
   console.log(x + y); (a) Error (b) 61 (c) 7
8. 8.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) console.log() (d) let
9. 9.⚡ What number does this code print?
   let a = 50;
   let b = 28;
   console.log(a + b);
10. 10.⚡ What number does this code print?
    let a = 11;
    let b = 9;
    console.log(a * b);
11. 11.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) on the printer (d) in the address bar
12. 12.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Kabir (b) Hi, name! (c) Hi, Kabir! (d) name
13. 13.⚡ What number does this code print?
    let a = 21;
    let b = 2;
    console.log(a + b);
14. 14.⚡ Which JavaScript word runs code when true? (a) if (b) for (c) alert() (d) console.log()
15. 15.⚡ What number does this code print?
    let a = 55;
    let b = 27;
    console.log(a + b);
16. 16.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <script> (d) <code>
17. 17.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) for (d) if
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y); (a) Error (b) 11 (c) 65
19. 19.⚡ Which JavaScript word repeats code? (a) console.log() (b) alert() (c) let (d) for
20. 20.⚡ What number does this code print?
    let marks = 8;
    marks = marks + 3;
    marks = marks - 6;
    console.log(marks);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) 16 (b) 97 (c) Error
22. 22.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Arjun (d) Hi, Arjun!
23. 23.⚡ What number does this code print?
    let a = 38;
    let b = 28;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let a = 2;
    let b = 10;
    console.log(a * b);
25. 25.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
26. 26.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Kabir (b) Well done, name! (c) name (d) Well done, Kabir!
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) Error (b) 10 (c) 28
28. 28.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Aman (c) name (d) Hello, Aman!
29. 29.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 6;
    marks = marks - 5;
    console.log(marks);
30. 30.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the domain name (c) the page title (d) only colours
31. 31.⚡ What number does this code print?
    let a = 20;
    let b = 5;
    console.log(a - b);
32. 32.⚡ Which JavaScript word makes a new variable? (a) let (b) if (c) for (d) alert()
33. 33.⚡ What number does this code print?
    let coins = 30;
    coins = coins + 5;
    coins = coins - 29;
    console.log(coins);
34. 34.⚡ What number does this code print?
    let a = 23;
    let b = 2;
    console.log(a + b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) 55 (b) Error (c) 10
36. 36.⚡ What number does this code print?
    let coins = 21;
    coins = coins + 19;
    coins = coins - 34;
    console.log(coins);
37. 37.⚡ What number does this code print?
    let a = 22;
    let b = 13;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 12;
    apples = apples - 1;
    console.log(apples);
39. 39.⚡ What number does this code print?
    let marks = 29;
    marks = marks + 5;
    marks = marks - 11;
    console.log(marks);
40. 40.⚡ What number does this code print?
    let a = 5;
    let b = 6;
    console.log(a * b);

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